CN1187432A - Tire pressure warning device with circuit device - Google Patents

Abstract

A tyre pressure warning device with circuit device is prepared as setting tyre pressure warning device on air valve of tyre, entering tyre pressure in tyre into shell from through hole, setting a printed circuit board in shell, setting detection emission circuit on printed circuit board to be a pressure sensing unit, a signal converter, a coding unit, a radio conversion unit and a first power supply unit, sending out radio signal when tyre pressure is detected to be too high or too low, receiving radio signal by signal receiving circuit and identifying source of radio signal for displaying or sending out alarm simultaneously.

Description

Tire pressure warning device with circuit device

The invention relates to a tire pressure warning device, in particular to a tire pressure warning device which enables the driver to more accurately grasp the tire pressure status of the tire through the mutual cooperation of the detection transmitting circuit and the signal receiving circuit.

General driving safety factors, in addition to the driver's driving conditions, and whether the components of the car itself (such as tires, braking systems, etc.) are normal, such as tires, if the tire pressure is too low or insufficient, it will easily cause tire tread damage Severe wear and tear will make the center of gravity of the vehicle body unstable, and if the tire pressure is too high, the tire may suddenly burst during driving, which will cause life-threatening danger to the driver and passengers in the vehicle, and even Endanger other running vehicles around, so there is a kind of tire pressure warning device available for users to test the tire pressure.

The previous tire pressure warning device can only detect the state of insufficient tire pressure. Therefore, in the improved device of the tire pressure warning device in Taiwan Patent Publication No. 186,905, it can not only detect whether the tire pressure is too low, but also detect whether the tire pressure is too low. Whether the pressure is too high/low. As shown in Figure 1, the improved device of the tire pressure warning device includes an outer shell 1, a cover 2, an inverted T-shaped push rod 3, a warning device 4 with a first circuit board 40 and a second circuit board 41 And a cover body 5, when measuring the car tire of normal pressure, after the tire pressure enters from the vent hole 103, if the power of the tire pressure is enough, it will push the pressure-bearing film 11 against, so that the push rod 3 pushes upwards, and the push rod 3 pushes up. The rod 3 passes through the central hole 412 of the second circuit board 41 to push the third conductive reed 411 upwards, so that the third conductive reed 411 is separated from the positive and negative connections. Therefore, the LED 404 is short-circuited by the power supply. If it cannot emit light, it means that the tire pressure of the tire is normal. On the contrary, if the strength of the tire pressure is insufficient to push the pressure-bearing film 11 and the push rod 3 upwards, so that the third conductive reed 411 is out of the conduction state on the second circuit board 41, the third conductive reed 411 will 411 will remain in the situation where the positive and negative poles are connected, that is, the tire's tire pressure is insufficient and must be replenished. In addition, if the force of the tire pressure is too large, pushing the pressure-bearing film 11 and the push rod 3 upward will not only make the third conductive reed 411 break away from the conduction state on the second circuit board 41, but also continue to move upward. To the first circuit board 40 and contact the first conductive reed 401, and then when the first conductive reed 401 touches the second conductive reed 402, the third conductive reed 411 will conduct on the The second conductive reed 402 on the first circuit board 40, that is, the tire pressure is too high, and the user must properly deflate the tire.

Although the above-mentioned tire pressure warning device can detect whether the tire pressure of the tire is too high or too low, it still has the following disadvantages:

1. Many components;

2. Because there are many components, the volume after assembly is quite large;

3. The accuracy is not accurate enough: because the tire pressure indicator adopts mechanical motion sensing tire pressure, there will be a phenomenon of mechanical fatigue. After a long time of use, poor contact and wear will occur, resulting in detection errors.

The purpose of the present invention is to provide a tire pressure warning device with a circuit device, which can simplify the structure of the tire pressure warning device, make the volume relatively smaller, and enable the driver to more accurately grasp whether the tire pressure is normal or not. High or low state.

The present invention is characterized in that: the tire pressure warning device can achieve sensing by means of a detection and emission circuit arranged on a printed circuit board in the tire pressure warning device, especially by a pressure sensor IC of the detection and emission circuit. The purpose and function of measuring the tire pressure is too high and too low, so the structure of the tire pressure warning device is simplified, and the volume is relatively reduced. And, because it belongs to electronic sensing, it has high precision.

Below in conjunction with accompanying drawing and embodiment the present invention is described in detail:

FIG. 1 is a combined cross-sectional view of an improved tire pressure warning device in Taiwan Patent Publication No. 124,990 of China.

Fig. 2 is a combined cross-sectional view of the tire pressure monitor of the preferred embodiment of the present invention.

Fig. 3 is a block diagram of the detecting and transmitting circuit in the above-mentioned preferred embodiment of the present invention.

FIG. 4 is a detailed circuit diagram of the pressure sensing unit of the detection and emission circuit in FIG. 3 .

Fig. 5 is a block diagram of the signal receiving circuit in the above-mentioned preferred embodiment of the present invention.

As shown in Figure 2, the circuit device of the tire pressure warning device of the present invention includes a detection and transmitting circuit 7 (shown in Figure 3) arranged in the tire pressure warning device 6 and a signal receiving circuit 8 installed on the vehicle instrument panel (shown in Fig. 5), a tire pressure warning device 6 can be respectively correspondingly provided on several tires of the vehicle, and each tire pressure warning device 6 has a housing 60 and a screw lock on the housing 60 A cover body 62, the housing 60 is provided with a through hole 600 which is mutually arranged with the tire air nozzle, and a hollow push rod 601 is extended downward in the through hole 600, and an inlet is formed on the push rod 601 602, install the tire pressure warning device 6 on the tire air nozzle through the inlet 602, so that the tire pressure in the tire enters the casing 60 through the through hole 600, and the casing 60 is provided with a printed circuit board 61 , and the tire pressure is measured by a pressure sensor 700 on the printed circuit board 61 and a detecting and transmitting circuit 7 composed of other electronic components. If the measured tire pressure value is too high or too low, There can be a radio signal sent out, and the source of the radio signal is received and identified by the signal receiving circuit 8, and it is displayed or an alarm is issued at the same time, so that it can be known that the tire pressure of that tire or those tires is too high/over Low. As shown in FIG. 3 , the detection and transmission circuit 7 includes a pressure sensing unit 70 , a signal converter 71 , an encoding unit 72 , a radio conversion unit 73 and a first power supply device 74 .

What Fig. 4 shows is the detailed circuit diagram of this pressure sensing unit 70, and it comprises a pressure sensor 700, an impedance conversion circuit 701 and an amplifying circuit 75, and this pressure sensor 700 is a semiconductor pressure sensor, For example, the pressure sensor of the ADP1 DIP type of the NAIS brand produced by Matsushita Electric Works, as shown in Figure 2, the pressure sensor 700 is located at the bottom of the printed circuit board 61, and has a hollow pressure part 7001 extending to In the hollow ejector rod 601, the pressure sensing unit 70 can make the tire pressure entering the pressure part 7001 of the pressure sensor 700 output a voltage value (an analog signal) corresponding to the tire pressure through the impedance conversion circuit 701 , because the output voltage value is too small (about 100mv), the voltage will be amplified through the amplifying circuit 75 .

In this embodiment, the signal converter 71 is an IC numbered XR-4151, which converts the analog signal input from the pressure sensing unit 70 into a digital signal for output. This coding unit 72 is an ASIC or MPU, is the microprocessor that is numbered as PIC12C508 in the present embodiment, the digital signal that this signal converter 71 outputs, through the coding of this coding unit 72, then with this microprocessor The preset high-voltage reference value is compared with the low-voltage reference value, wherein the preset reference value and the comparison action can be achieved by burning the program in the microprocessor together, if the input digital signal is equal to or greater than the high-voltage reference value , then output a high-voltage signal, if the input digital signal is equal to or less than the low-voltage reference value, then output a low-voltage signal, the high-voltage signal and the low-voltage signal are digital pulse signals.

The radio conversion unit 73 can convert the high-voltage signal or low-voltage signal output by the encoding unit 72 into a radio signal for output.

The first power supply device 74 is formed by connecting a lithium battery or a mercury battery in series, and is electrically connected to the printed circuit board 61 in FIG. 2 , that is, the power body 610 on the printed circuit board 61. The device 74 can provide the power required for the operation of the pressure sensing unit 70 , the signal converter 71 , the encoding unit 72 and the radio conversion unit 73 .

As shown in Figure 5, the signal receiving circuit 8 is preferably installed on the dashboard of the car, so that the driver can also grasp the tire pressure status of each tire at the same time when the vehicle is moving. The signal receiving circuit 8 includes a radio signal The receiving unit 80 , a decoding unit 81 , a display device 82 and a second power supply device 83 , in addition, the signal receiving circuit 8 may further include an alarm system 84 .

The radio signal receiving unit 80 can receive the radio signal output from the radio conversion unit 73 of the detecting and transmitting circuit 7 and output it.

The decoding unit 81 is an ASIC or MPU. In the present embodiment, it is a microprocessor with a serial number of PIC16C54, which can decode the radio signal output by the radio signal receiving unit 80 to output a digital signal; the display device 82, After receiving the digital signal output by the decoding unit 81, the tire pressure status of each tire can be displayed. In this embodiment, a liquid crystal display (LCD, not shown) is used as a display. When the digital signal must pass through a display interface (figure not shown) just can drive LCD as display, makes driver can clearly know that the tire pressure of that tire or those tires is too high or too low by LCD display, and shows actual tire pressure value. In addition, an array of light-emitting diodes (LEDs) can also be selected as a display on the vehicle dashboard to display which tire's tire pressure is too high or too low and the actual tire pressure value.

The alarm system 84, after receiving the digital signal output by the decoding unit 81, amplifies the signal through the audio amplifier 840 of the alarm system 84, sends an alarm in the form of speech and sound, and outputs it through a loudspeaker 841 to notify the driver Abnormal state of human tire pressure. The audio amplifier 840 is an amplifier numbered LM386N.

The second power supply device 83 is a DC12V-24V car power supply, which can provide the radio signal receiving unit 80, the decoding unit 81, the display device 82 and the power required for the operation of the alarm system.

The display device 82 and the alarm system 84 are not necessarily included in the signal receiving circuit 8 at the same time, and only one of them can be selected.

In summary, the tire pressure warning device 6 of the present invention has the following advantages:

1. Reduction of components: the tire pressure warning device 6 is provided with a printed circuit board 61, and a pressure sensor 700 and a power supply body 610 are provided on the printed circuit board 61 to achieve the purpose of detecting tire pressure and effects.

Two, the volume is small: because the tire pressure warning device 6 of the present invention has few components, the volume after assembly will be quite small (as shown in Figure 2).

3. Improving the accuracy of tire pressure sensing: because the tire pressure warning device 6 of the present invention senses the tire pressure with a precision pressure sensor 700, which is different from the conventional mechanical motion sensing tire pressure, it will not It has the phenomenon of mechanical fatigue, and because it is electronic sensing, it has high accuracy.

Claims (5)

1. A tire pressure warning device with a circuit device, comprising a housing, the housing is provided with a through hole arranged with the tire air nozzle, the tire pressure warning device can be installed on the tire air nozzle, The casing is provided with a printed circuit board, and the circuit device includes a detection and emission circuit on the printed circuit board, which is characterized in that: The circuit device also includes a pressure sensing unit, a signal converter, a coding unit, a radio conversion unit and a first power supply device; The pressure sensing unit senses the tire pressure in the casing, and outputs a voltage value corresponding to the tire pressure, and the voltage value is an analog signal; The signal converter converts the analog signal input by the pressure sensing unit into a digital signal output; The encoding unit is the digital signal output by the signal converter, encoded by the encoding unit, and then compared with the high-voltage reference value and low-voltage reference value set in the encoding unit, when the input digital signal is equal to or greater than the high-voltage reference value , output a high-voltage signal, when the input digital signal is equal to or less than the low-voltage reference value, output a low-voltage signal, the high-voltage signal and the low-voltage signal are digital pulse signals; The radio conversion unit converts the high-voltage signal or low-voltage signal output by the encoding unit into a radio signal for output; The first power supply device provides the power required for the operation of the pressure sensing unit, the signal converter, the encoding unit and the radio conversion unit. 2. A signal receiving circuit applicable to claim 1, characterized in that: Contains a radio signal receiving unit, a decoding unit, a display device and a second power supply device; The radio signal receiving unit receives the radio signal output from the radio conversion unit of the detecting and transmitting circuit, and outputs it; The decoding unit decodes the radio signal output by the radio signal receiving unit to output a digital signal of a high-voltage or low-voltage control signal, and outputs the control signal; The display device corresponds to the tires of the vehicle, and displays the tire pressure status of each tire after receiving the control signal output by the decoding unit; The second power supply device provides the power required for the operation of the radio signal receiving unit, the decoding unit and the display device. 3. The signal receiving circuit applicable to claim 1 as claimed in claim 2, characterized in that: The display device is configured on the dashboard of the vehicle or an independent device, and uses a liquid crystal display as a display. 4. The signal receiving circuit applicable to claim 1 as claimed in claim 2, characterized in that: The display device is arranged on the instrument panel of the vehicle or an independent device, and includes multiple groups of light emitting diodes. 5. A signal receiving circuit applicable to claim 1, characterized in that: Contains a radio signal receiving unit, a decoding unit, an alarm system and a second power supply device; The radio signal receiving unit receives the radio signal output from the radio conversion unit of the detection and transmission circuit, and outputs it; The decoding unit decodes the radio signal output by the radio signal receiving unit to output a digital signal of a high-voltage state or a low-voltage state control signal, and outputs the control signal; After receiving the control signal output by the decoding unit, the alarm system sends out an alarm in the form of speech and sound; The second power supply device provides the power required for the operation of the radio signal receiving unit, the decoding unit and the alarm system.

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